I have a older, circa 2007, MBP that I just started having some issues with. The superdrive is unable to read or recognize any DVDs, regardless of the format or what's on them. It will read and burn CDs just fine; it's just DVDs that it has a problem with. Has this happened to anyone else, and how did you resolve this issue? It won't recognize my SL disk, so I can't even reinstall SL!